A processing apparatus includes: a processing container; a first injector extending in a longitudinal direction along an inner wall of the processing container, wherein the first injector includes a first introduction port formed at a lower end and first gas holes formed in the extending portion; and a second injector extending upward along the inner wall of the processing container, folded back at an upper portion, and then extending downward, wherein the second injector includes a second introduction port formed at a lower end of an upward extending portion and second gas holes formed in a downward extending portion. The first injector includes a first throttle portion having a cross-sectional area decreasing as a distance from the first introduction port increases. The second injector includes a second throttle portion formed in the downward extending portion and having a cross-sectional area decreasing as a distance from the second introduction port increases.